Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Tue, 24 Sep 2002 10:08:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Tue, 24 Sep 2002 10:08:38 -0400 Received: from mtao-m02.ehs.aol.com ([64.12.52.8]:13700 "EHLO mtao-m02.ehs.aol.com") by vger.kernel.org with ESMTP id ; Tue, 24 Sep 2002 10:08:34 -0400 Date: Tue, 24 Sep 2002 07:13:39 -0700 From: John Gardiner Myers Subject: Re: [RFC] adding aio_readv/writev To: linux-aio Cc: linux-kernel Message-id: <3D907313.8040704@netscape.com> MIME-version: 1.0 Content-type: multipart/signed; boundary=------------ms070103060007020405020001; micalg=sha1; protocol="application/x-pkcs7-signature" X-Accept-Language: en-us, en User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.2a) Gecko/20020910 References: <3D8B878C.8070503@watson.ibm.com> <1032555981.2082.10.camel@dell_ss3.pdx.osdl.net> <3D8F256D.1070107@watson.ibm.com> <20020923114104.A11680@redhat.com> <3D9066AD.6030904@netscape.com> <20020924145225.J3160@redhat.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6149 Lines: 101 This is a cryptographically signed message in MIME format. --------------ms070103060007020405020001 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Stephen C. Tweedie wrote: >No, all you can infer from that is that "some method for avoiding >small packets is important for networking." TCP_CORK already does >that in Linux, for tcp at least, without requiring writev. (Of >course, normal nonblocking writev is still there if you want it.) > TCP_CORK is indeed effective for avoiding small packets. Be that as it may, the source data for network writes are frequently in discontiguous buffers and writev is nonetheless still important for networking. The alternative in the aio model is to waste a lot of resources delivering io completions the application doesn't care about. --------------ms070103060007020405020001 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIK7TCC A4UwggLuoAMCAQICAlvfMA0GCSqGSIb3DQEBBAUAMIGTMQswCQYDVQQGEwJVUzELMAkGA1UE CBMCQ0ExFjAUBgNVBAcTDU1vdW50YWluIFZpZXcxGzAZBgNVBAoTEkFtZXJpY2EgT25saW5l IEluYzEZMBcGA1UECxMQQU9MIFRlY2hub2xvZ2llczEnMCUGA1UEAxMeSW50cmFuZXQgQ2Vy dGlmaWNhdGUgQXV0aG9yaXR5MB4XDTAyMDYwMTIwMjIyM1oXDTAyMTEyODIwMjIyM1owfTEL MAkGA1UEBhMCVVMxGzAZBgNVBAoTEkFtZXJpY2EgT25saW5lIEluYzEXMBUGCgmSJomT8ixk AQETB2pnbXllcnMxIzAhBgkqhkiG9w0BCQEWFGpnbXllcnNAbmV0c2NhcGUuY29tMRMwEQYD VQQDEwpKb2huIE15ZXJzMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDsB5tbTLWFycke FKQwy1MTNx7SFtehB26RBx2gT+6+5/sYfXuLmBOuEOU2646fK0tz4rFOXfR8TcLfxOp3anh2 3pKDAnBEOp5u75bEIwY5nteR0opdni/CTeyCfJ1uPuYdNKTYC088GwbpzhBRE8n1APHXCBgv bnGAuuYw/BqDtwIDAQABo4H8MIH5MA4GA1UdDwEB/wQEAwIFIDAdBgNVHSUEFjAUBggrBgEF BQcDAgYIKwYBBQUHAwQwQwYJYIZIAYb4QgENBDYWNElzc3VlZCBieSBOZXRzY2FwZSBDZXJ0 aWZpY2F0ZSBNYW5hZ2VtZW50IFN5c3RlbSA0LjUwHwYDVR0RBBgwFoEUamdteWVyc0BuZXRz Y2FwZS5jb20wHwYDVR0jBBgwFoAUKduyLYN+f4sju8LMZrk56CnzAoYwQQYIKwYBBQUHAQEE NTAzMDEGCCsGAQUFBzABhiVodHRwOi8vY2VydGlmaWNhdGVzLm5ldHNjYXBlLmNvbS9vY3Nw MA0GCSqGSIb3DQEBBAUAA4GBAHhQSSAs8Vmute2hyZulGeFAZewLIz+cDGBOikFTP0/mIPmC leog5JnWRqXOcVvQhqGg91d9imNdN6ONBE9dNkVDZPiVcgJ+J3wc+htIAc1duKc1CD3K6CM1 ouBbe4h4dhLWvyLWIcPPXNiGIBhA0PqoZlumSN3wlWdRqMaTC4P0MIIDhjCCAu+gAwIBAgIC W+AwDQYJKoZIhvcNAQEEBQAwgZMxCzAJBgNVBAYTAlVTMQswCQYDVQQIEwJDQTEWMBQGA1UE BxMNTW91bnRhaW4gVmlldzEbMBkGA1UEChMSQW1lcmljYSBPbmxpbmUgSW5jMRkwFwYDVQQL ExBBT0wgVGVjaG5vbG9naWVzMScwJQYDVQQDEx5JbnRyYW5ldCBDZXJ0aWZpY2F0ZSBBdXRo b3JpdHkwHhcNMDIwNjAxMjAyMjIzWhcNMDIxMTI4MjAyMjIzWjB9MQswCQYDVQQGEwJVUzEb MBkGA1UEChMSQW1lcmljYSBPbmxpbmUgSW5jMRcwFQYKCZImiZPyLGQBARMHamdteWVyczEj MCEGCSqGSIb3DQEJARYUamdteWVyc0BuZXRzY2FwZS5jb20xEzARBgNVBAMTCkpvaG4gTXll cnMwgZ8wDQYJKoZIhvcNAQEBBQADgY0AMIGJAoGBAMkrxhwWBuZImCjNet4bJ6Vdv/iXgHQs oXf8wdBaJZ2X6jJ17ZzlSha9mmwt3Z9H8LFfVdS+dz29ri1fBuvf0rcxPWdZkKi6HDag2yNV f3CV+650RlyzuQr2RNeirkKvaocmakRdplHRw81Txxoi5sCMrkVPmRWA35ILnNbn6sTvAgMB AAGjgf0wgfowDwYDVR0PAQH/BAUDAweAADAdBgNVHSUEFjAUBggrBgEFBQcDAgYIKwYBBQUH AwQwQwYJYIZIAYb4QgENBDYWNElzc3VlZCBieSBOZXRzY2FwZSBDZXJ0aWZpY2F0ZSBNYW5h Z2VtZW50IFN5c3RlbSA0LjUwHwYDVR0RBBgwFoEUamdteWVyc0BuZXRzY2FwZS5jb20wHwYD VR0jBBgwFoAUKduyLYN+f4sju8LMZrk56CnzAoYwQQYIKwYBBQUHAQEENTAzMDEGCCsGAQUF BzABhiVodHRwOi8vY2VydGlmaWNhdGVzLm5ldHNjYXBlLmNvbS9vY3NwMA0GCSqGSIb3DQEB BAUAA4GBAExH0StQaZ/phZAq9PXm8btBCaH3FQsH+P58+LZF/DYQRw/XL+a3ieI6O+YIgMrC sQ+vtlCGqTdwvcKhjjgzMS/ialrV0e2COhxzVmccrhjYBvdF8Gzi/bcDxUKoXpSLQUMnMdc3 2Dtmo+t8EJmuK4U9qCWEFLbt7L1cLnQvFiM4MIID1jCCAz+gAwIBAgIEAgAB5jANBgkqhkiG 9w0BAQUFADBFMQswCQYDVQQGEwJVUzEYMBYGA1UEChMPR1RFIENvcnBvcmF0aW9uMRwwGgYD VQQDExNHVEUgQ3liZXJUcnVzdCBSb290MB4XDTAxMDYwMTEyNDcwMFoXDTA0MDYwMTIzNTkw MFowgZMxCzAJBgNVBAYTAlVTMQswCQYDVQQIEwJDQTEWMBQGA1UEBxMNTW91bnRhaW4gVmll dzEbMBkGA1UEChMSQW1lcmljYSBPbmxpbmUgSW5jMRkwFwYDVQQLExBBT0wgVGVjaG5vbG9n aWVzMScwJQYDVQQDEx5JbnRyYW5ldCBDZXJ0aWZpY2F0ZSBBdXRob3JpdHkwgZ8wDQYJKoZI hvcNAQEBBQADgY0AMIGJAoGBAOLvXyx2Q4lLGl+z5fiqb4svgU1n/71KD2MuxNyF9p4sSSYg /wAX5IiIad79g1fgoxEZEarW3Lzvs9IVLlTGbny/2bnDRtMJBYTlU1xI7YSFmg47PRYHXPCz eauaEKW8waTReEwG5WRB/AUlYybr7wzHblShjM5UV7YfktqyEkuNAgMBAAGjggGCMIIBfjBN BgNVHR8ERjBEMEKgQKA+hjxodHRwOi8vd3d3MS51cy1ob3N0aW5nLmJhbHRpbW9yZS5jb20v Y2dpLWJpbi9DUkwvR1RFUm9vdC5jZ2kwHQYDVR0OBBYEFCnbsi2Dfn+LI7vCzGa5Oegp8wKG MGYGA1UdIARfMF0wRgYKKoZIhvhjAQIBBTA4MDYGCCsGAQUFBwIBFipodHRwOi8vd3d3LmJh bHRpbW9yZS5jb20vQ1BTL09tbmlSb290Lmh0bWwwEwYDKgMEMAwwCgYIKwYBBQUHAgEwWAYD VR0jBFEwT6FJpEcwRTELMAkGA1UEBhMCVVMxGDAWBgNVBAoTD0dURSBDb3Jwb3JhdGlvbjEc MBoGA1UEAxMTR1RFIEN5YmVyVHJ1c3QgUm9vdIICAaMwKwYDVR0QBCQwIoAPMjAwMTA2MDEx MjQ3MzBagQ8yMDAzMDkwMTIzNTkwMFowDgYDVR0PAQH/BAQDAgEGMA8GA1UdEwQIMAYBAf8C AQEwDQYJKoZIhvcNAQEFBQADgYEASmIO2fpGdwQKbA3d/tIiOZkQCq6ILYY9V4TmEiQ3aftZ XuIRsPmfpFeGimkfBmPRfe4zNkkQIA8flxcsJ2w9bDkEe+JF6IcbVLZgQW0drgXznfk6NJrj e2tMcfjrqCuDsDWQTBloce3wYyJewlvsIHq1sFFz6QfugWd2eVP3ldQxggKmMIICogIBATCB mjCBkzELMAkGA1UEBhMCVVMxCzAJBgNVBAgTAkNBMRYwFAYDVQQHEw1Nb3VudGFpbiBWaWV3 MRswGQYDVQQKExJBbWVyaWNhIE9ubGluZSBJbmMxGTAXBgNVBAsTEEFPTCBUZWNobm9sb2dp ZXMxJzAlBgNVBAMTHkludHJhbmV0IENlcnRpZmljYXRlIEF1dGhvcml0eQICW+AwCQYFKw4D AhoFAKCCAWEwGAYJKoZIhvcNAQkDMQsGCSqGSIb3DQEHATAcBgkqhkiG9w0BCQUxDxcNMDIw OTI0MTQxMzM5WjAjBgkqhkiG9w0BCQQxFgQU0XqWMT7VGkb2Lh+iT0Uha5ey9LEwUgYJKoZI hvcNAQkPMUUwQzAKBggqhkiG9w0DBzAOBggqhkiG9w0DAgICAIAwDQYIKoZIhvcNAwICAUAw BwYFKw4DAgcwDQYIKoZIhvcNAwICASgwga0GCyqGSIb3DQEJEAILMYGdoIGaMIGTMQswCQYD VQQGEwJVUzELMAkGA1UECBMCQ0ExFjAUBgNVBAcTDU1vdW50YWluIFZpZXcxGzAZBgNVBAoT EkFtZXJpY2EgT25saW5lIEluYzEZMBcGA1UECxMQQU9MIFRlY2hub2xvZ2llczEnMCUGA1UE AxMeSW50cmFuZXQgQ2VydGlmaWNhdGUgQXV0aG9yaXR5AgJb3zANBgkqhkiG9w0BAQEFAASB gHz1JLgSoTgvdZoUlySFywGrsoq27Cdak56fsbE2HSJVflsI6Lb9JkjpywIA1dcBBE1iQDPr msZnBHIGsEBnlJwuQLAKVoy9zsfNRerLz8qf4ErCxNkNLqjoll89kYEaBBTHSAM9DFl7rpr2 mVT9dza69960wFffCJziTzBneKTZAAAAAAAA --------------ms070103060007020405020001-- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/